February 11th, 2013, 5:30 pm ·

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Los Angeles police had received more than 600 tips by Monday morning on the whereabouts of Christopher Dorner.

Authorities announced Sunday that a $1 million reward was being offered for information that leads to the arrest and conviction of the fugitive homicide suspect.

People with tips about Dorner’s whereabouts may call 213-486-6860. As he is still considered armed and extremely dangerous, anyone who thinks they see him should call 911 immediately.

The LAPD is working with Riverside police, Irvine police and the FBI as part of a task force dedicated to finding and arresting Dorne, who is suspected of killing Riverside police Officer Michael Crain and an Irvine couple, Monica Quan and Keith Lawrence. He is also wanted for the attempted murder of Crain's trainee and of two LAPD officers who were shot at shortly before Crain's death.

At a morning news conference, LAPD Lt. Andy Neiman said police have been in contact with Dorner's family, who are cooperating.

"Our hope is he'll turn himself in," Neiman said.

The LAPD has been on tactical slert, responding only to the highest-priority calls while otherwise focused on the manhunt to find Dorner. Up to 50 officers and their families who were mentioned in a threatening manifesto Dorner wrote remain under police protection.

Neiman did not know how much the investigation has cost so far, but he said, "There has been a substantial cost to this city and taxpayers."

Meanwhile, 30 San Bernardino County sheriff's deputies continue to search for Dorner in Big Bear, where his pickup was found on fire and with a broken axleThursday.

"Big Bear is still a critical piece of the investigation," Neiman said.

Police are hoping the tip line will bring an end to the manhunt.

"Our mission is to find Mr. Dorner and make this city safe again," Neiman said.>

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